Hot-blast stove



(No Model.)

13.1.AMoN-D..

l`HOT BLAST r'S'OVEL No. 311.190. Patented Jan. 27, 1885.

. Inventor 1111 gq',

N. PETERS, Pl\aloL|!hvgmplmr. Washinglcn. D. C.

Attorney wir* ihvrren Srarns Fares@ @Frio a..

DAVID LAMON D, OF ALLEGHENY, PENNSYLVANIA.V

H OT- BLAST STOVE.

SPECIFICATION forming part of Letters Patent No. 311,190, dated January 27, 1885,

` Application filed November i7, 1884. (No model.)

To all whom it may concern,.-

In all of the views many details essential to Be it known that I, DAVID LAMOND, of l the completeness of the stove, but not essen- Al-legheny, Allegheny county, Pennsylvania, have invented certain new and useful Improvementsin Hot-Blast Stoves, of which the following is a specification.

This invention pertains to improvements in vertically-arranged regenerative hot-blast stoves; and it relates to improvements in construction whereby amore uniform and efficient heating action is secured from the regenerative brick-work, and whereby the destructive effects due to differential contraction and eX- pansion are lessened. In this class oi'regenerative hot-blast stoves the line-work, the regenerative brickwork, represents a great length of heatway. It is i'ound almost impossible in practice to properly heat the final end of this heatway, and it is found that, in the usual attempts in this direction, the walls oi' the combustion-chamber at the initial end of the heatway are destroyed by the intensity of the combustion-in other words, the cold side of the stove is seldom hot and the hot side becomes heated to destruction. I seek to lessen the intensity of the heat at the initial end of the heatway and to increase the heat at the final end. The internal brick-work of these stoves is generally crowned with roofarches, and the whole structure is inclosed in a plate-iron shell. It is found in practice that in many cases the expansion of the brick-work pulls the iron shell in two, in case the shell is utilized as an abutment for the roof-arches of the briolowork. I seek to avoid the possibility of pulling the shell in two and still to retain the use of the shell as an abutment for t-he roof-arches of the brick-work.

The invention will be readily understood from the following description, taken in connection with the accompanying drawings, in Which- Figure 1 is a vertical diametrical section of a hot-blast stoveembodying my improvements, the section being upon 'the line marked c in Fig. 2, viewed in the direction indicated by the arrow at c; Fig. 2, a double sectional plan of the stove, the upper portion being upon the line a, and the lower portion upon the line b, of Fig. l; and Fig. 3 an enlarged portion of Fig. l at about the juncture of the crown of the stove with its cylindrical body.

tial to an understanding of the present points` of novelty, are omitted.

In the drawings, A represents the cylindrical iron shell ofthe stove; B, the arch-shaped roof portion ot'V the shell; C, the cylindrical shell-wall ofthestove, constructed ofiire-brick, as usual; D, the usual roof-arches of the wall` work; E, the usual filling, of crushed oinderor analogous material, between the shell-wall and the shell; F, the usual wall reaching from the bottom of the stove to near the top, and forming a wall of the combustion-chamber; G, a wall reaching from the roofot the stove to near the bottom of the stove; H, a wall reaching from the bottom of the stove to near its roof; I, wall-work between the wallHand the shellwork of the stove, forming a portion of t-he regenerator; J, similar wa-ll-work disposed between the walls F and G; K, an aperture at the base of the stove, and leading to the coinbustion-chamber, and serving, as usual, for the admission of the heating-gas when the stove is being heated, and for the exit of the heated air when the stove is under blast, the aperture to be fitted with the usual branches and valves; L, an aperture at the base of the stove, at the foot of the regenerative work I, and leading to the chimney through the usual chimney-valve; M, piers at the base of the stove supporting the wallG; N, a chamber underneath the iioor of'the combustionchamber; 0, a valve admitting air to this chamber; P, ports leading upward from the chamber N into the combustioirchaniber; Q, a chamber underneath the iloor, below the regenerative work J; It, a valve arranged to admit air to the chamber Q; S, ports leading upward from the chamber Q into the base-spaces of the stove at the foot ot' the wall G; T, a chamber underneath the iloorof the stove, below the uptake formed between walls Gand H; U, a valve arranged to ad mit gas t0 thischamber; V, ports leading upward through the door of the stove from the chamber T; XV, the usual Vvalve through which the cold blast enters the stove at the foot of the regenerative work I; X, that point near the top ot' the stove where the archwork of the roof joins the cylindrical portion oi' the stove; Y, plate-iron rings secured to the metal of the cylindrical portion of the me- IOO tallic stove-shell and to the arch portion of the metallic stove-shell; Z, a channel-iron ring secured between and at the periphery of the rings Y; d, the eombustionchamber of the stove; e, the uptake formed between the walls G and I-I.

The stove is operated in the usual manner. When being heated, the gas enters at K, receives air of combustion through the ports I), goes into combustion, and passes up the combustion-chamber D, passes down the regenerative flue-work J, turns under the wall G, between the piers M, passes up the uptake e, turns over the top of the wall H, passes down the regenerative flue-work I, and passes out through aperture L to the chimney, heating the brick-work of the stove during its passage. v

As beforementioned, the gas in combustion fails to properly heat the final portion I of the regenerator, and the intensity of the heat in the combustion-chamber tends to work destruction to the brick-work of the initial side ofthestove. It is usual to adm it the air of combustion at various points along the pathway of the gas, for the purpose of prolonging as much as possible the heating-flame. Under such a system we have necessarily au imperfect combustion in the combustion-chamber 'and destructive heat in thecombustion-chamber and a failure to properly heat the final passways.

By my present system I admit gas and air in the usual manner at the foot of the combustion-chamber in such proportions as to secure perfect combustion, and in such quantities as to Secure a high heating-power, measured with an eye to the preservation of the brickwork ofthe combustion-chamber. time I admit gas and air from t-he chambers Q, and T through the ports S and V, at the foot of the uptake e, in proportions adapted to the thorough combustion of the gas there admitted, and in quantities adapted to eifect-the thorough heating of the regenerative wallwork I.

When the stove is heated. all of the gas and air is shut off, as usual, the chimney-valve closed, the hot-blast outlet connected with K opened, and the cold blast forced in at W, the cold blast traversing the highly-heated brick- Work in a direction the reverse of that followed by the heating-gas.

By the means and method described I secure a thorough heating of all of the brick- Y work, and I reduce the heat at the foot of the combustion-chamber.

Atthesame It is desirable that the roof-arches D abut upon the metal shell of the stove, either direct or through the agency of the filling E. The effect of this abutting, in the ordinary construction, is that the rising of the top brickwork, when expanding, lifts the iron roof of the stove and pulls the stove-shell in two. In cases where the shell is not broken the archwork is liable to hang when lifted, and tumble in when the supporting-walls shrink downward from them hence it has, previous to my improvements, been considered impracticablc to utilize the iron shell of the stove as an abutment for the arches of the roof-work. The expansion-spaces necessarily left between the arches and the iron shell result in exceedingly weak arches oryin exceedingly expensive ones, and' almost always in both. The rings Y- and Z form an expansion-joint in the metallic shell of the stove, the plates of the shell being lapped, but not riveted, as clearly indicated in Fig. 3, whereby the material of the filling is excluded from the interior ofthe expansionjoint, and whereby the upper and lower sections of the shell are at liberty to move with reference to each other. The roof-section of the metallic shell rises and falls with the brick work ofthe arches, and also accompanies them as a surrounding abutment.

I claim as my invention I. In a Vertical regenerativehot-blast stove, the combination, with an initial combustionchamber provided with a gas and an air inlet, of a gas and air inlet at the f'oot ofthe second uptake in the stove, between the combustioncliamber and the chimney-point of the stove, substantially as and for the purpose set forth.

2. rIhe combination, with the initial combustion-chamber provided with inlets for gas and air, and the uptake c, between such combustion-chamber and the chimney-point of the stove, ofchamber T,ports V, gas-valve U, chamber Q, ports S, and air-valveR, located at the foot of such uptake, substantially as and for the metal shell, substantially as and for the purpose set forth.

DAVID LAMOND.

Witnesses: l

A. M. WILKIE, HENRY G. HARGRAvns. 

